Oil-engine.



H. T. RASER.

OIL ENGINE. APPLICATION FILED DEC. 29. 1914.

1163,04. Patented Dec. 7, 1915.

' WITNESSES IN I/EN T013 B Y WLH I I A TTORIVEYS HARRY T. RASER, OI ASHTABULA, OHIO.

OIL-ENGINE.

Specification of Letters Patent.

Patented Dec. 7.1915.

Application filed December 29, 1914. Serial No. 879,486.

T 0 all whom it may concern Beit known that I, HARRY T. RAsnR, a citizen of the United States, residing at Ashtabula, in the county of Ashtabula and State of Ohio, have invented certain new and useful Improvements in Oil-Engines,

of which the following is a specification.

This invention relates to an improvement in internal combustion engines.

One of the principal objects of the inven-- tion is to'provide an improved internal combustion-engine or attachment in which the firing mixture is ignited through the heat generated by the compression alone of the mixture.

Another object is to provide an internal combustion engine with an attachment in the shape of an auxiliary cylinder in which the firing mixture may be compressed or partially ignited, means being provided whereby progressive ignition will ensue in a larger or main cylinder for obtaining complete combustion and a maximum degree of expansion whereby to drive the main piston.

Still another object ofthe device is to provide an improved engine of the class described having main and auxiliary cylinders in tandem, the latter being of smaller bore than the former, and having an auxiliary piston connected with and operable coincident with the main piston and adapted'to operate in pressing the firing mixture to the required degree therein, the arrangement being such that when partial combustiontakes place in the mixture the latter is allowed to escape into the main cylinder and commingle with the air therein to attain the complete combustion and expansion for driving the main piston. j

A further object of the invention 'is to provide an engine of the class described which will be extremely simple, durable, efficient in operation and inexpensive to manufacture.

With these and other objects in view which will become apparent as the description proceeds, the invention resides in the construction, combination and arrangement of parts, hereinafter more fully described and claimed, and illustrated in the accompanying drawing, in which like characters of reference lDCllCtltQllkG parts throughout the several figures, of which- Figure 1 represents a view in section taken centrally through the cylinders of an theauxiliary cylinder for com-' engine constructed according to my invention. Fig; 2 represents an enlarged view in section taken through the auxiliary cylinder showing the air intake valve and fuel control valve in detail. Fig. 3 represents a view in section taken horizontally on the line 33 of Fig. 2. i l i In the drawing I have shown a two cycle engine constructed and operated on the principle involved in my invention, but it is understood that the principle is equally ap- 1 plicable to engines of the four cycle type.

In the drawing the crank case is indicated at 5, the main cylinder at 6, the auxiliary cylinder-at 7, the main piston at 8, and the auxiliary piston at 9. The main and auxiliary cylindersare arranged in tandem, the latter as indicated having a bore. much smaller in diameter thanthe bore of the main cylinder 6. Piston 9 is rigidly connected to the main piston through the medium of a stem 10.

Arranged in the head 11 of the cylinder 7 y is the intake valve 12. It controls the inlet of air and oil to the auxiliary cylinder, being adapted to open upon downward strdke. of piston .9 for filling the auxiliary cylin der with the combustible mixture of air and oil, and adapted when the piston 9 moves upwardly, to close, whereby to cut off the supply of air and 011.

Any suitable fuel may be used, the engine being adapted to handle oils in their various refined or unrefined state for the production of power. I

A- fuel tank isindicated at 13 and communicates by means of a pipe 1'4: with a passage 15 in the cylinder head 11. Said passage at its inner end is adapted to be controlled by valve 12, andthe'fiow of oil through the passage is controlled by the fuel regu'lating valve 16.

An air passage 17 leads from the crank" case to the cylinder 6, and communi'cates with the latter at a point substantially in alinenient or slightly above the upper surface of piston 8 when the latter is in its lowermost position. An air intake point 18 is provided in the cylinder and controlled by piston 8, said port being opened for'allowing admission of air to the crank case,'when the piston is in its uppermost position, and

being closed by the piston in its downward movement.

The exhaust manifold is indicated at 19 and communicateswith cylinder 6 opposite the upper end of passage 17, through the exhaust port 20.

The walls of auxiliary cylinder 7 near the upper end of said cylinder, are provided with a plurality of "diametrically opposed grooves 21 having concaved floors 22. a The grooves run longitudinally of cylinder 7 and are somewhat longer than the piston 9 iswide. The engine may be started in the usual way, and by mechanical means or manually.

The. operation ot' the engine is as follows:

Upon the downstroke-ot' piston 9 the valve 12 is opened admitting a mixture of oil and air into the atnxiliary cylinders. As the piston 9 moves upwardly it compresses the combustible mixture to such a degree that 'ust as the'piston reaches-a point in cylinder l coincidentwith the lower ends of the recesses or ports 21, the compression attains such a degree that the heat of the compressed gases vaporizes and i gnites them, and as the piston .9 moves upwardly past' the ports 21- combustion of the gases takes place'resulting in an expansion,-\\"hicli drives the piston 8 downwardlyi As the latter imoves downwardly'it 'closes inlet port 18 and comp1resses the air in the crankcase?) and upon the uncovering of the opening 'atthe upper end of passage 17, the compressed air in the crank case rushes upwardly through passage 17 into thecylinder 6, as tlie' burnt gases contained insaid cylinder exhaust through port 20 into the exhaust manifold. Upon the return upward movement of piston-8 port 20 and the'opening at the upper end of passage 17 are simultaneously closed, and the inlet port 18 is opening as the piston reaches the upper terminal of its stroke, so that air may again be admitted to the crankcase, and the operation continues as described. The area of piston 8, is of course greater area of piston 9 so that upon combustion taking place in the cylinder, piston 8 will be driven down as stated. The length of cylinder 6 is such, that when the piston S is at the iipperend ot' itsstroke, there will be a space between said piston and the'auxiliary cylinder 7, which space is filled with compressed air above the piston. 4

The cylinder 7, is formed with an annular outwardly extending flange at its lower end, which flange forms the head of cylinder The flange is connected by machine bolts or i the upper end of cylinder 6.

Although I have described the preferred einbodin'ient of my invention, I may desire mg gases pass around the piston'through the tively in the main and than the other suitable fastenings 23 toto makesuch changes in the construction,

combination and arrangement of parts therein the auxiliary cylinder, a stem fixedly connecting the main and auxiliary pistons, an intake valve arranged in the head ot the auxiliary cylinder and adapted to control the intake of air and fuel, said valve adapted .to be opened upon downward movement ot the auxiliary piston for drawing the coin- -bustible mixture into the auxiliary cylinder,

said auxiliary cylinder provided with a plurality of recesses in its inner walls and extending longitudinally thereof, said recesses being disposed adjacent the upper end of said auxiliary cylinder, said recesses being of a length somewhat greater than the width of tlieauxiliary piston, said auxiliary piston adapted as it moves upwardly within the auxiliary cylinder, to compress the combustible mixture contained in the latter to the point of ignition whereby the burning mixinto the cylinder below the piston as said piston uncovers said recess, substantially as described.

ture will pass around the auxiliary piston;

2. An internal combustion engine com Y prising a niaincylinder and an auxiliary cylinder arranged in tandem said auxiliary cylinder being of a diameter less than the diameter of themain cylinder, a mainand an auxiliary piston. fixedly connectedtogether and adapted to reciprocate respecau'xiliary cylinders, said auxiliary piston adapted to compress a combustible mixture within the auxiliary cylinder to the point of ignition, a valve for controlling the mixture to the cylinder, said auxiliaiy cylinder being provided with recesses adapted to be uncovered by the auxiliary piston as the mixture ignites, whereby to allow the burning mixture to pass around the piston into the cylinder below said auxiliary piston, substantially as described.

An internal combustion engine includmg a crank case, a main cylinder connected admission of the combustible tion with the main cylinder, an auxiliary piston adapted to reciprocate within the auxiliary cylinder and fixedly connected with the main piston, said auxiliary piston adapted to compress a combustible mixture within the auxiliary cylinder above said auxiliary piston, means for controlling the admission of combustible mixture to the auxiliary cylinder, and means associated with the auxiliary cylinder and adapted as the point of ignition isreached by the compressed mixture, to allow passage of the burning mixture into the cylinder below the auxiliary piston, substantially as described. 4. An internal combustion engine including a main and an auxiliary cylinder arranged in tandem, main and auxiliary pistons adapted to reciprocate respectively in the main and auxiliary cylinders and being .fixedly connected together, said auxiliary piston adapted to compress a combustible mixture within the auxiliary cylinder to the I point of ignition, said auxiliary cylinder provided with ports adapted to be uncovered by the auxiliary piston as the compressed mixture reaches the point of ignition for al- Gopies of this patent may be obtained for lowingpassage of said mixture into the cylinder below the auxiliary piston, and means auxiliary pistons being fixedly connected together, a fuel supply, means communicating with the auxiliary cylinder and fuel supply above the auxiliary piston, means for controlling the admission of fuel and air to the auxiliary cylinder, said auxiliary piston adapted tocompress the combustible mixture to the point of ignition within the outer end of the auxiliary cylinder, and means for allowing passage of the burning mixture into the auxiliary cylinder below the auxil- .ia'ry piston, as the point of ignition is reached.

HARRY T. vRASER.

Witnesses:

E. P. HALL, BLANGHE MANN.

five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

